What is Force?
Balanced or Unbalanced Forces
Contact Forces
Non-Contact Forces
Bonus!
(Science Investigation Skills)
(Science Investigation Skills)
100
True or False
Force is a type of push on an object
False
Force is a push or pull that happens when two obsjects interact
100
True or False
A change in motion occurs once forces are balanced
False
Balanced forces result in no change in motion
100
True or False
Water waves hitting the sandy beach is a contact force
True!
100
True or False
A charged balloon pulling up your hair an example of a non-contact force
True!
This is electrostatic force
100
True or False
Tables and graphs don't need a title.
False!
200
What is the unit of measurement for force?
Newtons (N)
200
What happens when frictional force acts on an object?
It opposes motion.
(force that resists motion when the surface of one object comes in contact with the surface of another)
200
What is the definition of a contact force?
A force that occurs when two objects are touching
200
What must an object have in order to be affected by gravitational force?
a. Charge
b. Mass
c. Magnetism
Mass
200
What is an independent variable?
One factor that is changed in the experiment (the 'cause' of the experiment)
300
List 3 things that forces can do
1. begin to move
2. speed up
3. Slow down
4. Stop moving
5. Change direction of motion
6. Change Shape
7. Remain still
300
Calculate the net force, state if the forces are balanced, and explain what will happen. 
Net force is 17N to the right
Forces are unbalanced
Objet will have positive acceleration to the right.
300
State three examples of a contact force
- Kicking a football.
- Throwing a basketball.
- Pushing a car.
- Leaning against the wall.
- Hitting a billiard ball
- Pulling a wooden desk.
- Plucking a mushroom from garden.
- Flipping a page of book
300
State the three types of non contact forces
Magnetic force
Gravitational force
Electrostatic force
300
When do you use a bar graph and when do you use a line graph?
Bar graphs use rectangular blocks to represent many different types of data, whereas line graphs use lines and represent trends over time
400
Can you see a force? Explain why.
You cannot see a force.
You can only observe the effect of a force.
400
When a plane is flying at a constant speed and elevation in the sky, four forces are acting on it.
Lift, Weight, Thrust, and Drag force.
Use a whiteboard to draw a force diagram of the plane.
400
You use your hand to push a box along the table (applied force). Draw a force diagram on a whiteboard to demonstrate the effect of the contact force. Include arrows for weight force and normal force.
400
State two terms that describe the effect of magnetic force.
Attraction and Repulsion
(attract/repel)
400
Draw a graph and label where the following are:
- Independent Variable (IV)
- Dependent variable (DV)
- Title
500
Each team member must take turns to say and demonstrate a force in the classroom
"The force of ______ on _______."
500
When you push a brick wall, why doesn't it fall over? Why can a bulldozer push it over?
When you push against a brick wall it doesn't fall over because the wall pushes back on you with an equal and opposite force. A bulldozer can push the wall over becasue it can push harder than you can on the wall and the wall can't withstand this force with an equal and opposite force. This creates a net unbalanced force in the direction that the bulldozer is pushing, and the wall falls over.
500
One person is pushing the back of a car and is exerting a force of 200N east. However, someone else is pushing the front of the car and is exerting a force of 150N west.
Draw a labelled free-body (force) diagram to demonstrate the net force applied by the contact force.
500
Draw a diagram to show electromagnetic waves when the poles of two magnets are attracted to each other.
Remember to label the poles.
500
State the definition and give an example of:
1. Qualitative Observation
2. Quantitative Observation
1. Qualitative Observations are descriptive and do not involve a measurement
e.g., "that car is moving fast"
2. Quantitative observations are those that involve measurement (with units).
e.g., "The length of the car is 4m"